When server.js receives a static path it does not recognize, it serves up

index.html instead. This is useful when a user reloads a page in the SPA --
server.js does not know this path, but by serving up the SPA again the SPA
knows how to handle that URL. This makes the app behave in a manner a user
expects when reloading a page.

bin/server.js

@@ -191,10 +191,25 @@ function main() {
     server.head(API_RE, proxy);
 
     // where to serve static content from
-    server.get(STATIC_RE, mod_restify.plugins.serveStatic({
+    let staticHandler = mod_restify.plugins.serveStatic({
         directory: 'static',
         default: 'index.html'
-    }));
+    });
+    server.get(STATIC_RE, function staticFunnel(req, res, next) {
+        staticHandler(req, res, function fileFound(err) {
+            // If we didn't find the requested static file, serve up the
+            // default (index.html) instead. This is useful when a user reloads
+            // some page in the SPA, since the path does not match anything the
+            // backend knows, but the SPA reloaded through index.html will know
+            // what to do with the original URL.
+            if (err && err.statusCode === 404) {
+                req.url = '/';
+                staticHandler(req, res, next);
+            } else {
+                next(err);
+            }
+        });
+    });
 
     // enable HTTP server
     server.listen(CONFIG.server.port, function listening() {